Vrontero (Greek: Βροντερό, before 1926: Γκράσδενι – Gkrasdeni)[2] is a village in the Florina Regional Unit in Western Macedonia, Greece.

[3] In the early 1900s, 276 Slavonic speaking Christians lived in the village.

[4] They were a group of nomadic transhumant Aromanians (known as the Arvanitovlachs) originating from Thessaly and the Greek government assisted their settlement into depopulated villages of the Prespa region like Vrontero.

[7] In fieldwork done by anthropologist Riki Van Boeschoten in late 1993, Vrontero was populated by Aromanians.

[7] The Aromanian language was used by people of all ages, both in public and private settings, and as the main language for interpersonal relationships.